CN1250892A - Development apparatus - Google Patents

Development apparatus Download PDF

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Publication number
CN1250892A
CN1250892A CN99120753A CN99120753A CN1250892A CN 1250892 A CN1250892 A CN 1250892A CN 99120753 A CN99120753 A CN 99120753A CN 99120753 A CN99120753 A CN 99120753A CN 1250892 A CN1250892 A CN 1250892A
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Prior art keywords
regulating part
developer layer
developer
layer regulating
developing apparatus
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CN99120753A
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CN1133102C (en
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井上淳志
巽洋
山中隆幸
酒井孝司
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Sharp Corp
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Sharp Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade

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  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

To provide a developing device using an elastic blade suitable for the expanding of the assembling tolerance of the elastic blade for a developing roller, the stabilization of an elastic blade abutting load to secular or environmental change, the improvement of the degree of freedom of specific circular frequency setting and also the miniaturization of the developing device. A rectangular hole 304 is formed in a width direction at an area between the developing roller 100 of the elastic blade 300 and the supporting end part 303 of an abutting part 302. Thus, since the fluctuation gradient of the line pressure (free end abutting load) of the abutting part 302 to the displacement (deflection) of a developer layer regulating member top end is suppressed to be small by reducing the geometrical moment of inertia, so that the assembling tolerance is expanded.

Description

Developing apparatus
The present invention relates to utilize electrophotography to carry out a kind of developing apparatus of using on the machine of image generation such as duplicating machine, printer, facsimile recorder one class.More particularly, the present invention relates to a kind of like this developing apparatus, this developing apparatus utilizes a flexible tabular developer layer regulating part, removes to regulate the developer that is supplied in the developer supporting, have with formation specific quantity electrostatic charge, a developer layer that pre-determines thickness; And this developing apparatus can be delivered to this developer layer on the electrostatic latent image, and this developing electrostatic latent image is become the image that can see.
Usually, a kind of two component formula developing apparatuss of what is called three component developers that use is made up of a kind of toner and a kind of magnetic carrier, because needing a toner concentration regulating device to keep the mixing ratio of this toner and this magnetic carrier is constant, therefore the shortcoming of this developing apparatus is a complex structure, and size is big and cost an arm and a leg.On the other hand, form by a kind of toner in the use, do not have a kind of advantage of one-component formula developing apparatus of developer of so-called a kind of one-component of magnetic carrier to be, simple in structure; Therefore, can do compactly, simultaneously, cost lower and keep in repair more convenient easily.
Single component formula developing apparatus can be divided into two kinds of forms roughly, that is: use a kind of potpourri of resin and ferromagnetic powder, or use with the magnetic one-component formula developing apparatus of magnet grains as resinous a kind of magnetic color tuner of core; With use the nonmagnetic one-component formula developing apparatus of forming, do not have a kind of nonmagnetic toner of magnetic material by resin and pigment.
Known this magnetic one-component formula developing apparatus has two kinds of systems: first kind of system is contactless toning system, in this system, utilizes a non magnetic development sleeve with a magnet roller to carry above-mentioned magnetic color tuner; Simultaneously, between this development sleeve and photosensitive drum adapted thereto, be provided with the two ends in the space in a predetermined gap, add an AC field, above-mentioned toner is reciprocally beated, develop like this.Second kind of system is the contact toning system, in this system, by forming a big toner brush, contacts with the lip-deep above-mentioned electrostatic latent image of above-mentioned photosensitive drum adapted thereto, develops like this.This previous system need superpose development bias voltage and alternating voltage of a DC voltage, therefore, and the power supply complexity; And this developing apparatus is wanted can be high voltage withstanding.On the other hand, a kind of system in this back only needs a simple direct current developing bias supply to get final product, but the high gamma that is produced (Hi-gamma, γ) gradation of image is bad.
Above-mentioned non magnetic one-component formula developing apparatus also has two kinds of systems.First kind of system is contactless toning system, in this system, an AC field is added in the development roller that is provided with a predetermined gap between the two and the two ends in the space between the photosensitive drum adapted thereto, this toner is reciprocally beated, develop like this.Second kind of system is the toning system of contact, in this system, by make this conduction, flexible development roller contacts with this photosensitive drum adapted thereto, develop like this.A kind of system needs the development bias voltage of a DC voltage before being somebody's turn to do, with an alternating voltage stack, therefore, and the power supply complexity, and this developing apparatus wants energy high voltage withstanding.On the other hand, a kind of system in this back only needs a simple direct current developing bias supply.Owing to use the non magnetic one-component formula developing apparatus of a kind of toner that does not have magnetic material, do not use any magnet roller, therefore, the advantage of this system is that clearly color developing unit of a kind of compact conformation, low price and colour can be provided.
For all one-component formula developing apparatuss, must on developing roller or development sleeve, this form developer (toner) layer of a frictional electrification with predetermined bed thickness.
As the method that on above-mentioned development roller, forms a developer (toner) layer, flat 4 No. 73152 of No. clear 63 the 16736th, Japanese patent publication and Japanese patent publication, announced to have an elastic adjusting plate, or the device of a flat flexible frictional electricity element.No. clear 62 the 182780th, Japanese Laid-Open Patent Application has been announced a kind of developer layer regulating part, and this regulating part has a sheet metal that has spring property; Be integral with this sheet metal with one, and the soft elastic part between this sheet metal and the supporting of above-mentioned developer.
For one long-time in uniform developer layer of formation, the ratio that Japanese patent publication defines the drift of developer regulating part to the thickness of the sheet spring of this regulating part clear 6 No. 93152.
Generally, one has flexible tabular developer layer regulating part (hereinafter referred to as " elastic doctor blade "), can be modeled as one and be bearing in a semi-girder 335 on the fixed support 355, as shown in Figure 1.
Act on and be close to load P (kgf) on the free end of semi-girder shown in Figure 1 335, and the relation between the amount of deflection δ of this semi-girder (millimeter), available following formula (1) expression:
P=(3EI/L 3) E in 8 (1) formulas: elastic modulus (kgf/millimeter 2);
I: geometrical moment of inertia (millimeter 4);
L: semi-girder drift (millimeter).
From as can be seen with following formula (1), when the material of this semi-girder and shape of cross section immobilize (EI=constant), act on the load P that is close on this semi-girder free end, be directly proportional with this free-ended amount of deflection δ, and with cube being inversely proportional to of the drift L of this semi-girder.
When elastic doctor blade of design, the material of this scraping blade, drift L, slab-thickness t and the free-ended amount of deflection δ of this scraping blade are according to being added on this scraping blade free end, deciding for suitably form the needed load P that is close to of above-mentioned toner layer on above-mentioned development roller.Here, because the free-ended amount of deflection δ of this elastic doctor blade, be to determine by the fixed position of this elastic doctor blade with respect to above-mentioned development roller, therefore, the fixed position error of this elastic doctor blade, will be as the error of this scraping blade free end amount of deflection δ, thereby also be that the error that is close to load P that is added on this scraping blade free end occurs.
In addition, the off-centre of this development roller, radially runout etc. will make the load P that is close to that is added on this elastic doctor blade free end change.The wearing and tearing of this development roller bearing, thermal expansion and contraction with the supporting member (i.e. the housing of this developing apparatus) of this development roller and this elastic doctor blade, and the variation of ambient environmental conditions, also As time goes on (passage of time) changes the load P that is close to that is added on this elastic doctor blade free end.By reducing (3EI/L 3), promptly reduce the free-ended amount of deflection of this elastic doctor blade, be close to proportionality constant between the load P on δ and this scraping blade free end, can strengthen the fixed position error of this elastic doctor blade, or the surplus of the location tolerance of this scraping blade.Generally, the drift L of this elastic doctor blade is by the decision of the size and dimension of above-mentioned developing apparatus, therefore, be difficult to this length do than this developing apparatus need greatly.In addition, in order to make this developing apparatus compactness, will shorten the drift L of this elastic doctor blade inevitably, this more can increase aforementioned proportion constant (3EI/L 3).
Because elastic modulus E is a characteristic value of this elastic doctor blade material, therefore, the leeway of selection more is restricted.So, in order to reduce this proportionality constant (3EI/L 3), more real way is the value that reduces this geometrical moment of inertia I.
Simultaneously, the fundamental vibration circular frequency ω of semi-girder 335 shown in Figure 1 nRepresent by following formula (2):
Figure A9912075300071
γ in the formula: the quality (kilogram/millimeter of semi-girder material unit volume 3);
A: the cross-sectional area of this semi-girder (millimeter 2).
From above formula (2) as can be seen, when the material of this semi-girder and drift immobilize, the fundamental vibration circular frequency ω of this semi-girder 335 n, be directly proportional with the square root of above-mentioned geometrical moment of inertia I.
When off-centre owing to above-mentioned development roller, and/or radially runout and rotation; Or because creeping of causing of the frictional resistance variation of this elastic doctor blade and this development roller, when making the free end of this elastic doctor blade be subjected to vibrating, this elastic doctor blade may produce resonance, and to the adverse effect that is formed with of toner layer.
Because as mentioned above, be restricted at drift L that selects this elastic doctor blade and the dirigibility aspect its elastic modulus E, therefore, for fear of this elastic doctor blade, at its fundamental vibration circular frequency ω nThe place produces resonance, preferably controls the geometrical moment of inertia I of this elastic doctor blade.
The geometrical moment of inertia I of this elastic doctor blade is provided by formula (3):
I=Ht 3The slab-thickness (millimeter) of this elastic doctor blade of t-in/12 (3) formulas;
The whole width (millimeter) of this elastic doctor blade of H-.
In above formula (3), the whole width H of this elastic doctor blade is one and forms the relevant constant of width with this developer layer.Therefore, in order to reduce this geometrical moment of inertia I, must reduce the slab-thickness t of this elastic doctor blade.Yet, from the manufacture process viewpoint of this elastic doctor blade, or use viewpoint, reducing of this elastic doctor blade slab-thickness is conditional.That is, must reduce the geometrical moment of inertia I of this elastic doctor blade, not cause the slab-thickness of this elastic doctor blade to be decreased to again above essential degree.
Yet,, can only change this geometrical moment of inertia I by the slab-thickness t that changes this scraping blade for common elastic doctor blade.Therefore, it is very little to increase the above-mentioned design flexibility that is close to the load surplus, in addition, considers the variation of time lapse and the change of environmental baseline, can not select to form the fundamental vibration circular frequency of this elastic doctor blade of above-mentioned toner layer because the resonance of this elastic doctor blade influence causes.
The present invention considers that above-mentioned problem proposes.Therefore, one object of the present invention is that a kind of developing apparatus with a kind of like this elastic doctor blade will be provided, and this elastic doctor blade can be from strengthening its build-up tolerance with respect to above-mentioned development roller; And can be As time goes on and the change of environmental baseline, make act on this elastic doctor blade to be close to load stable; The dirigibility aspect the fundamental vibration circular frequency of selecting this elastic doctor blade can also be improved, and the size of this developing apparatus can be reduced.
In order to achieve the above object, the present invention constitutes as follows:
According to a first aspect of the invention, a developing apparatus comprises:
Be used to keep a developer to support with the supplying developing agent; With a flexible flat developer layer regulating part, an end of this regulating part is supported and fixes, and the other end is a free end; This regulating part is close in this developer supporting near its free-ended planar section, so that form the developer layer of a specific thickness in this developer supporting; Along at this developer layer regulating part, be close to the part that is close to of this developer supporting, and the width in the zone between the fixed bearing end of this regulating part, forming one is the white space that is made of a through hole and/or recess at least.
According to a second aspect of the invention, a developing apparatus comprises:
One is used to keep the developer with the supplying developing agent to support; With a flexible flat developer regulating part, one end of this regulating part is supported and fixes, the other end is a free end, and, this regulating part is near its free-ended planar section, abut against in this developer supporting, so that in this developer supporting, form the developer layer of a specific thickness; Wherein, along the part that is close to that is close at this developer layer regulating part in this developer supporting, and the width in the zone between the fixed bearing end of this regulating part, form many white spaces that constitute by a plurality of through holes and/or recessed part; On this developer regulating part, on corresponding zone, the middle part (being that developer layer forms the zone) that is this developer supporting at least, form many shapes white space identical with above-mentioned white space shape with certain interval.
According to a third aspect of the invention we, have above-mentioned second characteristic this developing apparatus be characterized as above-mentioned white space ratio (L h/ P) be set at 0.5 or littler; In the formula: L hBe full-size along the width of the white space that on this developer layer regulating part, forms; And the pitch between the white space that P is a white space to be adjacent.
According to a forth aspect of the invention, being characterized as of this developing apparatus with above-mentioned second or the 3rd characteristic, this white space ratio on two stub areas of this developer layer regulating part is set forr a short time than this white space ratio on the center section of this regulating part.
According to a fifth aspect of the invention, have above-mentioned first, second or the 3rd characteristics this developing apparatus be characterized as ratio (L h/ L v) be set at 1 or littler; In the formula: L hBe full-size along the width of this white space that on this developer layer regulating part, forms; And L vBe the full-size on the direction vertical with the width of this white space.
According to a sixth aspect of the invention, have above-mentioned the 4th characteristics this developing apparatus be characterized as ratio (L h/ L v) be set at 1 or littler; In the formula: L hBe full-size along the width of this white space that on this developer layer regulating part, forms; L vBe the full-size on the direction vertical with the width of this white space.
According to a seventh aspect of the invention, have being characterized as of this developing apparatus of above-mentioned first characteristics,, form the multiple row white space along the width of this developer layer regulating part.
According to an eighth aspect of the invention, being characterized as of this developing apparatus with above-mentioned first, second, third, the 6th or the 7th characteristic, with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, form described at least one white space.
According to a ninth aspect of the invention, being characterized as of this developing apparatus with above-mentioned the 4th characteristics, with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, form described at least one white space.
According to the tenth aspect of the invention, being characterized as of this developing apparatus with above-mentioned the 5th characteristics, with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, form described at least one white space.
According to an eleventh aspect of the invention, being characterized as of this developing apparatus with above-mentioned first, second, third, the the the 6th, the 7th, the 9th or the tenth characteristic, through hole at this developer layer regulating part forms at least one surface in zone, and the flexible flexible seal of some greatly than this developer layer regulating part is housed.
According to a twelfth aspect of the invention, being characterized as of this developing apparatus with above-mentioned the 4th characteristics, through hole at this developer layer regulating part forms at least one surface in district, and the flexible flexible seal of some greatly than this developer layer regulating part is housed.
According to a thirteenth aspect of the invention, being characterized as of this developing apparatus with above-mentioned the 5th characteristics, through hole at this developer layer regulating part forms at least one surface in district, and the flexible flexible seal of some greatly than this developer layer regulating part is housed.
According to a fourteenth aspect of the invention, being characterized as of this developing apparatus with above-mentioned the 8th characteristics, through hole at this developer layer regulating part forms at least one surface in district, and the flexible flexible seal of some greatly than this developer layer regulating part is housed.
According to a fifteenth aspect of the invention, being characterized as of this developing apparatus with above-mentioned the 11 characteristics, through hole at this developer layer regulating part forms at least one surface in district, and the flexible flexible seal of some greatly than this developer layer regulating part is housed.
According to a sixteenth aspect of the invention, have being characterized as of this developing apparatus of above-mentioned first or second characteristic, this developer layer regulating part comprises an elastic metal sheet.
According to a seventeenth aspect of the invention, have being characterized as of this developing apparatus of above-mentioned first or second characteristic, this developer supporting comprises the elasticity roller of a conduction.
According to an eighteenth aspect of the invention, have being characterized as of this developing apparatus of above-mentioned first or second characteristic, this developer is a kind of nonmagnetic monocomponent toner.
According to a first aspect of the invention, because on this developer layer regulating part, support immediate compact parts with this developer, and the width in the zone between the fixed bearing end of this developer layer regulating part, form at least one white space, therefore, can reduce geometrical moment of inertia, with can reduce to act on above-mentioned developer layer regulating part near the linear load on the part (acting on the load that is close on this developer layer regulating part free end), with respect to the variable gradient of the displacement (amount of deflection) of the front end of this developer layer regulating part.Like this, can amplify build-up tolerance.In addition owing to can freely select the vibration performance frequency of this developer layer regulating part, therefore can prevent since this developer layer regulating part vibrate developer layer that (resonance) cause form bad, thereby can obtain the distinct image reproduction.
According to a second aspect of the invention, because along the width of this developer layer regulating part (be at least part) therebetween, form the identical white space of many opening shapes with certain clearance, therefore, act on the linear load on the center section of this this developer layer regulating part that is used to form a developer layer, can freely set, irrelevant with the thickness of slab and the drift of this developer layer regulating part.Therefore, can form a desirable developer layer that adapts with image-region.
According to a third aspect of the invention we, because above-mentioned white space ratio (L h/ P) be set at 0.5 or littler (in the formula: L hBe full-size along the width of the white space that on this developer layer regulating part, forms; P is the pitch between the white space that is adjacent of a white space), therefore, can prevent white space zone from this developer layer regulating part, extend to the free-ended place of this regulating part, this developer layer regulating part can not compress the generation of the problem of developer supporting, like this, just can guarantee to form stable developer layer.
According to a forth aspect of the invention, because this white space ratio on two stub areas of this developer layer regulating part (along the width of this regulating part), set for littler than this white space ratio on this regulating part center section, therefore, although the linear load on two stub areas of this developer layer regulating part is not too little, still can avoid toner to let out from the two ends of this developer supporting.
According to the of the present invention the 5th and the 6th aspect, because ratio (L h/ L v) be set at 1 or littler (in the formula: L hBe full-size along the width of the white space that on this developer layer regulating part, forms; L vBe the full-size on the direction vertical with the width of this white space), therefore, can strengthen the flexible of this developer layer regulating part, thereby, can reduce the size of this developing apparatus.
According to a seventh aspect of the invention, because width along this developer layer regulating part, form the multiple row white space, therefore, can be by multiple row through hole combination with simple shape (for example, circle), or the multiple row recess made up, strengthen the flexible of this developer layer regulating part, thereby can reduce the size of this developing apparatus and form stable developer layer.
According to the 8th to the tenth aspect of the present invention, because with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, form at least one white space, therefore, of the free-ended influence of above-mentioned these openings can be eliminated, thereby more stable developer layer can be formed this developer layer regulating part.
According to the 11 to the 15 aspect of the present invention, because the through hole at this developer layer regulating part forms at least one surface in district, be provided with its flexible flexible big seal than this developer layer regulating part, therefore, can prevent that toner is scattered away by the hole that forms, and so can not reduce the flexible of this developer layer regulating part yet on this developer layer regulating part.
According to a sixteenth aspect of the invention, because this developer layer regulating part comprises an elastic metal sheet, therefore, the perforation procedure of this developer layer regulating part can be simplified, and this will make the manufacturing cost of this developer layer regulating part reduce.
According to a seventeenth aspect of the invention, because this developer supporting comprises the elasticity roller of a conduction, therefore do not need the developing bias voltage power supply of a complexity, thereby can obtain do not superpose bias voltage, compact conformation, the cheap developing apparatus of direct current development of alternating voltage of a use (for example).
According to an eighteenth aspect of the invention, because developer is a kind of nonmagnetic monocomponent toner, therefore, can obtains one and can produce developing apparatus extraordinary coloured image, compact conformation.
Fig. 1 is the figure of a semi-girder of expression;
Fig. 2 is the schematic sectional view of the developing apparatus of a kind of electrofax of an expression use elastic doctor blade 300 according to an embodiment of the invention;
Fig. 3 is the skeleton view of the user mode of an expression elastic doctor blade 300 according to an embodiment of the invention;
Fig. 4 is the front view of an expression elastic doctor blade 300 according to an embodiment of the invention;
Fig. 5 A to 5C is the front view of expression according to the elastic doctor blade of each different embodiment of the present invention;
Fig. 6 is the skeleton view of seal 345 of expression attached to a concrete structure on the elastic doctor blade 300 of one embodiment of the present of invention;
Fig. 7 A is the front view of an expression elastic doctor blade 300b according to another embodiment of the invention;
Fig. 7 B is the d in Fig. 7 A 1-d 2The sectional view that line is got; With
Fig. 7 C is the d in Fig. 7 A 1-d 2Another sectional view that line is got.
Below, describe embodiments of the invention with reference to the accompanying drawings in detail.
Fig. 2 is the schematic sectional view of the developing apparatus of a kind of electro photography of expression use a kind of elastic doctor blade of the present invention, in Fig. 2, the diameter of an electronegative photosensitive drum adapted thereto 51 is 65 millimeters, and this photosensitive drum adapted thereto rotates on the direction of arrow a with the peripheral speed of 190 mm/second.The conductive substrates ground connection of this photosensitive drum adapted thereto, and the surface potential of this drum is-550 volts.A development roller 100 is placed in the opposite of this photosensitive drum adapted thereto 51, and this development roller 100 is by housing 1 supporting of above-mentioned one-component formula developing apparatus.
Development roller 100 is that a diameter is the elasticity roller of 34 millimeters conduction, and this development roller is made by a kind of chemglaze (urethane rubber) of conduction, has added a kind of conductive agent (for example carbon black etc.) in the chemglaze, and its specific insulation is approximately 10 6(ohmcm), JIS-A hardness are the 60-70 degree, and surfaceness is the R according to JISB-0601 z=3～6 microns.
This development roller 100 contacts with above-mentioned photosensitive drum adapted thereto 51, and its contact degree of depth is 0.1～0.3 millimeter; A toner layer is arranged between this development roller and photosensitive drum adapted thereto.This development roller 100 turns round on arrow b direction with the peripheral speed of 285 mm/second; Simultaneously ,-450 volts developing bias voltage from a developing bias supply 110, is a stainless steel shaft of 18 millimeters by diameter, is added on this development roller 100.
A toner supply roller 200 stirs the toner in the housing 1 that is stored in box-shaped near its bottom, and, after development, dispose and remain in this development roller 100 lip-deep toners.The elasticity roller that the foamed material that this toner supply roller is a conduction is made, diameter is 20 millimeters, specific insulation is about 10 5(ohmcm), reticular density (cellular density) is 80～140 micropore/inches, durometer level is for spending 30 degree to Asker C hardness level from 60 of Asker F hardness level.
Here, the hardness of this Asker C hardness level is to utilize a kind of hardness tester of spring to draw, and meets the measured value of JIS S6050.Compare with Asker C durometer, the hardness of this Asker F hardness level, be to utilize one to have diameter be 25.2 millimeters cylindrical pressure head, load on spring be 55 the gram to 455 the gram (corresponding to durometer level is 0～100 the degree), compressive surfaces is the measured value that the durometer of a circle of 80 millimeters of diameters draws.Above-mentioned two kinds of measurements all are that the durometer that utilizes KOBUNSHI KEIKI company to produce carries out.
Above-mentioned toner supply roller 200 contacts with above-mentioned development roller 100, and it contacts degree of depth is 0.5～1 millimeter, and with the peripheral speed of 170 mm/second, turns round on the direction of arrow C; Simultaneously, toner supply bias voltage of-550 volts from a toner supply grid bias power supply 210, is 8 millimeters a stainless steel shaft by a diameter, is added on this toner supply roller 200.
Elastic doctor blade 300 is that thickness is a flexible stainless steel substrates of 0.1～0.2 millimeter, and its structure is a semi-girder; The free end 301 of this semi-girder is in the upstream with respect to the gyratory directions of this development roller 100.
The supported end 303 of this elastic doctor blade 300 (relative with this free end 301) is by scraping blade bearing 350 clampings; And near a planar section 302 of this free end 301, be close to the surface of above-mentioned development roller 100, its linear load that is close to be 10～50 gram forces/centimetre.The scraping blade bias voltage of this elastic doctor blade is-550 volts, is added on this scraping blade 300 by a scraping blade grid bias power supply 390.
A bottom sealing 400 is used to prevent that this toner from leaking.The sealing 400 of this bottom is that 0.2～0.4 millimeter polyester (Mylar) film is made by thickness.
If necessary, this bottom sealing 400 can use al deposition film etc. to make conduction, and the conductive surface that this bottom is sealed is close on above-mentioned development roller 100.Like this, can will seal voltage grid bias power supply 410, identical with the development bias voltage of this development roller 100 from a bottom, or than this development bias voltage high about 50 volts or a more voltage, be added on this development roller 100, so that on above-mentioned toner, produce the effect of removing electric charge.
In the device of this structure, filled into electronegative by this toner supply roller 200 in advance, and be applied to the toner of the lip-deep above-mentioned nonmagnetic one-component of this development roller 100, regulated by above-mentioned elastic doctor blade 300, making and being bonded in these development roller 100 lip-deep toning dosage is 0.6～1.0 milligram/centimetre 2, amount of electrostatic charge is-10～-15 μ C/g, oppositely develops so that carry out contact.
Interrelate therewith, because the influence of effective resistance r that should the development roller and the development current i that in developing process, flows into, can produce a voltage drop V in that this development roller is inner d=i * r.Therefore, by suitably adjusting the effective resistance of this development roller, can reduce the effective development bias voltage that is added on this development roller surface, make and the developing property of two kinds of dry and astringent toners can be improved to desirable toning characteristic.
Secondly, describe the elastic doctor blade 300 shown in Fig. 2 in detail with reference to accompanying drawing.
Fig. 3 is the skeleton view of the user mode of this elastic doctor blade 300 of expression, and in the drawings, this elastic doctor blade 300 that supported end 303 is clamped by scraping blade bearing 350 along the width of this scraping blade, carries out line with above-mentioned development roller 100 and contacts.In Fig. 3, the W on the development roller 100 tThe developer layer that expression forms above-mentioned toner layer forms the district; And W sThen expression does not form the non-developer layer formation district of this toner layer.Here, with part identical among Fig. 2, the label mark with identical will be explained below about rectangular opening 304.
Fig. 4 is the schematic elevational view of expression elastic doctor blade 300 shown in Figure 3.
In Fig. 4, the whole width H of this elastic doctor blade 300 is 320 millimeters, and its drift L is 18 millimeters.With above-mentioned development roller 100 on developer layer form district W tIn the corresponding zone,,, form the identical rectangular opening of a series of shapes 304 with identical distance along the longitudinal direction (Width) of this scraping blade.The L of each rectangular opening 304 h=2 millimeters, L v=9 millimeters; Wherein, L hBe width dimensions (at the longitudinal direction of this elastic doctor blade), L vBe the size on the direction vertical (promptly vertical direction) with the longitudinal direction of this scraping blade with this width.Distance between the above-mentioned adjacent rectangular opening 304 is 2 millimeters.Therefore, this rectangular opening 304 is arranged in the envoy apart from P, or the distance of the left hand edge from the left hand edge (left side among Fig. 4) of a rectangular opening 304 to next rectangular opening 304, is 4 millimeters.The stub area 305 of this elastic doctor blade 300 has 10 millimeters surplus, in this zone, does not form above-mentioned rectangular opening 304.
The position of this rectangular opening 304 without limits, but in this embodiment, the position of these rectangular openings, with respect to the free end 301 of this elastic doctor blade and the center section M of supported end 303, more close this supported end 303.
The longitudinal direction of this elastic doctor blade 300 is defined as the width of this scraping blade, or this elastic doctor blade 300 is close to the direction (see figure 3) on above-mentioned development roller 100 linearly.
The bearing of this elastic doctor blade that label 350 expressions had been mentioned.
Fig. 5 is the schematic elevational view of the various elastic doctor blade of expression.
The hole that forms on this elastic doctor blade can be triangle S 1The hole, shown in Fig. 5 A.In addition, can also form multiple row rectangular shape S 2The hole, shown in Fig. 5 B, or a kind of circular S 3The hole, shown in Fig. 5 C.Moreover, can also comprehensively form the multi-form hole of multiple row.Under each situation, hole S 1, S 2Or S 3More close each elastic doctor blade 306,307 in position or 308 elastic doctor blade bearing 350.
Such as already explained, (for example rectangular opening 304, hole S owing to a plurality of perforation 1Deng) be to be close to part 302 along this elastic doctor blade 300 and this development roller 100, and the formation of the width in the zone between the supported end 303 of this elastic doctor blade, therefore, can reduce above-mentioned geometrical moment of inertia, thereby can reduce this elastic doctor blade be close to linear load on the part 302 (Fig. 2 and 3) (free-ended be close to load), with respect to the variable gradient of the displacement (amount of deflection δ) of the free end 301 of this elastic doctor blade 300.The result, can make this elastic doctor blade bigger with respect to the initial build-up tolerance of the fixed position of above-mentioned development roller (Fig. 2 and 3), and can be As time goes on and the change of environmental baseline, form more stable toner layer, make the image that draws not have the even place of density unevenness.In addition, the eigen vibration frequency setting of this elastic doctor blade can be become desirable value, like this, can avoid because the problem that can not form above-mentioned toner layer that the vibration (resonance) of this elastic doctor blade 300 causes makes the image of reproduction very clear.
In the present invention, can form district W with above-mentioned developer layer at least tIn the corresponding zone,, with desirable distance at interval, form hole (for example, rectangular opening 304, the hole S of the identical a plurality of ideal forms of opening shape along the width of this elastic doctor blade 300 1, S 2And S 3).Therefore, can with the slab-thickness of this elastic doctor blade 300 and/or its drift irrespectively, set this and be close to part 302 and act on the developer layer that forms above-mentioned developer layer and form district W tOn, desirable linear load; Like this, just may form a desirable developer layer that adapts with image-region.
Owing on the stub area 305 of this elastic doctor blade 300, do not form perforation (for example, rectangular opening 304, hole S 1Deng), therefore, the stub area 305 of this elastic doctor blade 300, the power that is close to that acts on the above-mentioned development roller 100 can be too not little.So, can avoid toner to leak out from two stub areas 305 of this elastic doctor blade.
In the present invention, with size L hMaximal value and the ratio (L of above-mentioned pitch P h/ P) be set at 0.5 or littler (wherein, L h(see figure 4) is to form on this elastic doctor blade 300, such as rectangular opening 304, and hole S 1Etc. the full-size on the longitudinal direction (width H) of a plurality of perforation, and the P (see figure 4) is the pitch of these equidistant arrangements in hole), can avoid from this perforation (for example, the rectangular opening 304 on this elastic doctor blade 300, or S 1Hole etc.) zone extends to the area of the free end 301 of this elastic doctor blade, and this elastic doctor blade 300 can not compress the problem of development roller, thereby can form stable developer layer.
Though not expression, yet, perforation (for example, rectangular opening 304, hole S on will two stub areas 305 at this elastic doctor blade 300 1Deng) opening ratio (L h/ P), set than form district W at above-mentioned developer layer tThis opening ratio on the (see figure 3) hour, can avoid on the stub area 305 of this elastic doctor blade 300, above-mentionedly be close to the linear load that part 302 acts on the above-mentioned development roller 100 and reduce egregiously, therefore, can prevent that toner from leaking out from the stub area of this development roller 100.
With size L hMaximal value and size L vPeaked ratio (L h/ L v) be set at 1 or littler (wherein, L h(see figure 4) is perforation (for example, rectangular opening 304, the hole S that forms on this elastic doctor blade 300 1Deng) longitudinal direction (direction of width H) on full-size; And L v(see figure 4) is the full-size on the direction vertical with this width), can strengthen the flexible of this elastic doctor blade 300, therefore, can make this developing apparatus compact.
Along the width H (see figure 4) of this elastic doctor blade 300, form multiple row hole S 3Deng, can to strengthen the flexible of this elastic scraper 300, therefore can make this developing apparatus compact from some simple shapes (for example circle etc.) being lined up several rows, and can form desirable stable developer layer simultaneously.
With respect to the free end 301 of this elastic doctor blade 300 and the center section of supported end 303 (mid point of the direction vertical), on the zone of more close this supported end 303, form above-mentioned perforation (for example, rectangular opening 304, hole S with the width of this elastic doctor blade 300 1Deng), can eliminate this rectangular opening 304, hole S 1Therefore influence Deng to the free end 301 of this elastic doctor blade 300, can form more stable developer layer.
Because this elastic doctor blade 300 is to be made by a kind of elastic sheet metal (for example, a kind of flexible stainless steel substrates), therefore, such as rectangular opening 304, hole S 1Perforation procedure in the hole can be simplified, and like this, just can provide low-cost elastic doctor blade 300.
In the above-described embodiments, these elastic doctor blade 300 usefulness stainless steels are made, but this elastic doctor blade also can use the board-like material (for example, phosphor bronze, electroconductive resin etc.) of other conductions to make.
Because therefore the above-mentioned development roller 100 elasticity roller that is a conduction, does not need to use the developing bias supply of a complexity, thereby can form a development bias voltage that uses direct current, and the compactness of the alternating voltage that do not superpose and cheap developing apparatus.
In addition, because this developer is the developer of nonmagnetic one-component, therefore can form a developing apparatus that can produce the compactness of extraordinary coloured image.
And for example described in the above-described embodiments such, on this elastic doctor blade 300, form perforation (for example, rectangular opening 304, hole S 1, S 2Or S 3), can increase the initial build-up tolerance of this elastic doctor blade with respect to the fixed position of this development roller 100, therefore, As time goes on, a stable toner layer can be formed, thereby the image that do not have density unevenness even can be obtained with the variation of environmental baseline.Yet, above-mentioned rectangular opening 304, hole S 1Deng not necessarily needing is through hole (through hole).Below, explanation can be reached above-mentioned identical effect, but on this elastic doctor blade 300 (Fig. 2), do not have the structure of through hole.
Fig. 6 is illustrated on the facing surfaces on the surface that contacts with above-mentioned development roller 100, has on this elastic doctor blade 300 of many rectangular openings 304, adds the skeleton view of an embodiment of the seal 345 of this rectangular opening 304 of sealing.
In this case, sealing part 345 needs to use a kind of the flexible of height that have, and can not hinder the material of these elastic doctor blade 300 elastic deformations.In the present embodiment, used thickness is about 50 microns splicing tape as sealing part 345.This can successfully stop toner, shifts by the rectangular opening 304 that forms on this elastic doctor blade 300, thereby can prevent the toner duplicating machine fuselage of making dirty.In this respect, when above-mentioned seal 345 is fixed on the surface of this elastic doctor blade that contacts with this development roller 100, also can obtain same effect.
In Fig. 6, with identical part in the above accompanying drawing, represent with identical label, no longer describe.
Shown in Fig. 7 A, when elastic doctor blade 300b has with the identical shaped a plurality of pressure parts (recess) of a plurality of rectangular openings 304 of elastic doctor blade shown in Figure 3 300, the geometrical moment of inertia of this scraping blade reduces, therefore, can reduce to act on the linear load (this elastic doctor blade free-ended be close to load) on the part of being close to that contacts with above-mentioned development roller, with respect to the variable gradient of the displacement (amount of deflection δ) of the free end 301 of this elastic doctor blade 300b.Therefore, this structure has the effect identical with said structure.
Fig. 7 B and 7C are the d of expression along Fig. 7 A 1-d 2The figure of two examples in the cross section that line is got.Fig. 7 B is illustrated in the structure that has above-mentioned pressure part (recess) 304b on two surfaces of this elastic doctor blade 300b; Fig. 7 C only then represents to have the structure of above-mentioned pressure part 304b on the upper surface of this elastic doctor blade 300b.Here, the formation method of this pressure part 304b can come to determine selectively.For example (though not illustrating) at two lip-deep this pressure part 304b of this elastic doctor blade, forms the structure in a tortuous cross section that changes in the mode that replaces, and also has same effect.
In above embodiment explanation, preferred example of the present invention has been described, yet the present invention is confined to these examples.
For example, though above explanation is a developing apparatus at a kind of contact of the developer that utilizes a kind of nonmagnetic one-component carries out; But the present invention also can be used for a device that uses a kind of magnetic developer etc., as long as this developing apparatus can utilize flexible, a flat developer layer regulating part (elastic doctor blade), forms a developer layer and gets final product.In addition, obviously, be the development of contact no matter develop, or contactless development, the present invention all can adapt to.
In above embodiment explanation, this elastic doctor blade is a cantilever beam structure, and its free end is positioned at the upstream of this development roller gyratory directions, as shown in Figure 2.Yet the present invention also has, and can be used for this elastic doctor blade be a cantilever beam structure, and its free end is arranged in the structure in this development roller gyratory directions downstream.
Rectangular opening 304 on this elastic doctor blade, hole (S 1, S 2Or S 3), or the number of pressure part (recess) 304b, have no particular limits, but best, as among the above embodiment, form a plurality of such holes or recess.
In real work, used the numerical expression duplicating machine AR-5130 (product of company of Sharp (sharp)) of a repacking.
As mentioned above, according to a first aspect of the invention, can reduce above-mentioned linear load with respect to The variable gradient of the displacement of this developer layer regulating part front end, thereby can amplify location tolerance (by Be geometrical moment of inertia I littler, can reduce to act on bearing on this developer layer regulating part free end Carry the variation of P). In addition, owing to can freely select the feature frequency of the vibration of this developer layer regulating part Therefore rate, can prevent because the vibration (resonance) of this developer layer regulating part causes developer layer Form bad.
According to a second aspect of the invention, act on this development that this is used to form a developer layer Linear load on the mid portion of agent layer regulating part can free setting, regulates with this developer layer The sheet thickness of part and drift are irrelevant. Therefore, can form and the corresponding reason of image-region The developer layer of thinking.
According to a third aspect of the invention we, can prevent white space district from this developer layer regulating part The territory extends to this free-ended place of developer layer regulating part, and this regulating part can not compress the development roller Problem, therefore, can form stable developer layer.
According to a forth aspect of the invention, owing to act on two stub areas of this developer layer regulating part On linear load can be too not little, therefore, can avoid toner, from two of above-mentioned developer supporting End regions leaks out.
According to the of the present invention the 5th and the 6th aspect, can strengthen the flexible of this developer layer regulating part, Therefore, can reduce the size of developing apparatus.
According to a seventh aspect of the present invention, can pass through many row simple shapes (for example, circle) Sets of vias altogether, or with many row sets of recesses altogether, strengthen this developer layer regulating part Flexible, therefore, can reduce the size of this developing apparatus, and form stable developer layer.
According to the of the present invention the 8th to the tenth characteristics, the white space of this developing layer regulating part can not Can exert one's influence to the free end of this developer layer regulating part, therefore, can form more stable development The agent layer.
According to the 11 to the 15 aspect of the present invention, can prevent that toner from passing through at this developer The through hole that forms on the layer regulating part is scattered away, therefore, can not reduce scratching of this developer layer regulating part The property.
According to a sixteenth aspect of the invention, the perforation procedure of this developer layer regulating part can be simplified, Therefore, can reduce the manufacturing cost of this developer layer regulating part.
According to a seventeenth aspect of the invention, do not need the developing bias voltage power supply of a complexity, because of This (for example) can use a direct current developing bias voltage of the alternating voltage that do not superpose, thereby make development The apparatus structure compactness, cheap.
According to an eighteenth aspect of the invention, can obtain one can produce fabulous coloured image, The developing apparatus of compact conformation.

Claims (18)

1. developing apparatus, it comprises:
Be used to keep a developer to support with the supplying developing agent; With
A flexible flat developer layer regulating part, an end of this regulating part is supported and fixes, and the other end is a free end; This regulating part is close in this developer supporting near its free-ended planar section, so that form the developer layer of a specific thickness in this developer supporting; Wherein,, be close to the part that is close to of this developer supporting along at this developer layer regulating part, and the width in the zone between the fixed bearing end of this regulating part, forming one is the white space that is made of a through hole and/or recess at least.
2. developing apparatus, it comprises:
One is used to keep the developer with the supplying developing agent to support; With
A flexible flat developer regulating part, one end of this regulating part is supported and fixes, the other end is a free end, and, this regulating part is near its free-ended planar section, abut against in this developer supporting, so that in this developer supporting, form the developer layer of a specific thickness; Wherein, along the part that is close to that is close at this developer layer regulating part in this developer supporting, and the width in the zone between the fixed bearing end of this regulating part, form a plurality of white spaces that constitute by a plurality of through holes and/or recessed part; And, on this developer regulating part, forming on the corresponding zone, zone with middle part, the developer layer of this developer supporting at least, above-mentioned a plurality of white spaces form identical white space shape with certain interval.
3. developing apparatus as claimed in claim 2, wherein, above-mentioned white space ratio (L h/ P) be set at 0.5 or littler; In the formula: L hBe full-size along the width of the white space that on this developer layer regulating part, forms; And the pitch between the white space that P is a white space to be adjacent.
4. as claim 2 or 3 described developing apparatuss, wherein, this white space ratio on two stub areas of this developer layer regulating part is set forr a short time than this white space ratio on the center section of this regulating part.
5. as the described developing apparatus of claim 1,2 or 3, wherein, ratio (L h/ L v) be set at 1 or littler; In the formula: L hBe full-size along the width of this white space that on this developer layer regulating part, forms; And L vBe the full-size on the direction vertical with the width of this white space.
6. developing apparatus as claimed in claim 4, wherein, ratio (L h/ L v) be set at 1 or littler; In the formula: L hBe full-size along the width of this white space that on this developer layer regulating part, forms; L vBe the full-size on the direction vertical with the width of this white space.
7. developing apparatus as claimed in claim 1 wherein, along the width of this developer layer regulating part, forms the multiple row white space.
8. as claim 1,2,3,6 or 7 described developing apparatuss wherein, with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, form described at least one white space.
9. developing apparatus as claimed in claim 4 wherein, with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, forms described at least one white space.
10. developing apparatus as claimed in claim 5 wherein, with respect to the free end of this developer layer regulating part and the mid point between the fixed bearing end, on the zone of more close this fixed bearing end, forms described at least one white space.
11. as claim 1,2,3,6,7,9 or 10 described developing apparatuss wherein, form at the through hole of this developer layer regulating part at least one surface in zone, and a flexible flexible bigger seal than this developer layer regulating part is housed.
12. developing apparatus as claimed in claim 4 wherein, at least one surface that the through hole formation of this developer layer regulating part is distinguished, is equipped with the flexible flexible seal of some greatly than this developer layer regulating part.
13. developing apparatus as claimed in claim 5 wherein, at least one surface that the through hole formation of this developer layer regulating part is distinguished, is equipped with the flexible flexible seal of some greatly than this developer layer regulating part.
14. developing apparatus as claimed in claim 8 wherein, at least one surface that the through hole formation of this developer layer regulating part is distinguished, is equipped with the flexible flexible seal of some greatly than this developer layer regulating part.
15. developing apparatus as claimed in claim 11 wherein, at least one surface that the through hole formation of this developer layer regulating part is distinguished, is equipped with the flexible flexible seal of some greatly than this developer layer regulating part.
16. developing apparatus as claimed in claim 1 or 2, wherein, this developer layer regulating part comprises an elastic metal sheet.
17. developing apparatus as claimed in claim 1 or 2, wherein, this developer supporting comprises the elasticity roller of a conduction.
18. developing apparatus as claimed in claim 1 or 2, wherein, this developer is a kind of nonmagnetic monocomponent toner.
CN99120753A 1998-09-29 1999-09-28 Development apparatus Expired - Fee Related CN1133102C (en)

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JP274692/1998 1998-09-29
JP27469298A JP3432752B2 (en) 1998-09-29 1998-09-29 Developing device

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